To Construct the one-dimensional three sects photonic crystal with symmetrical structure in the form of (AB)N1 (BA)N2, a numerical calculation is conducted using the transfer matrix method of photonic crystal. It is
found that in the main prohibitive bands of transmission spectrum there are extremely narrow single transmission
peaks. The changing laws of the transmission peak position
λ with the changes of the period quantities Ni
(i=1,2), the refractive rate nj (j=1,2,3) and the thickness a, b and c are analyzed. It is concluded that they can be
approximately considered as linear in a small range and N1 = N2 = 7 is the optimal period quantities in theory.
Based on these characteristics, through the adjustment of the parameters, the light needed is distilled in the mixing
light in the range of 2280~2396 nm. The result is satisfactory.
Sampled fiber Bragg grating(SFBG) has caused extensive research interest due to its special filtering characteristic, strict
wavelength interval, compact structure, easy integration and low cost etc. Based on coupling-mode theory, the reflective
spectrum of sampled fiber Bragg grating was analyzed using transmission matrix method. Strain and temperature sensing
characteristics of sampled fiber Bragg grating were discussed in the paper. Wavelength shift and transmission intensity
vary linearly with strain and temperature. The change of strain and temperature can be determined simultaneously by a
single sampled fiber grating. In the experiment, the strain and temperature of sampled fiber Bragg grating change
simultaneously, the photoelastic coefficients of sampled fiber Bragg grating were P11=0.121, P12=0.27. The Poisson ratio
of optical fiber core stuff was 0.17, the thermal expansion coefficient was 5.5×10-7/°C, and the calorescence coefficient
of optical fiber was 8.3×10-6/°C. We can get that A, B, C and D were separately -0.00055nm/ε, 0.013nm/°C, -
0.00033/ε, -0.00011/°C by calculating. Strain measurement ranged from 0 με to 2500με. Temperature measurement ranged from 0°C to 300°C.
Simultaneous strain and temperature measurement system with fiber Bragg grating was presented in this paper. The light
from broadband source (BBS) was coupled into sensing probe through 3dB coupler1. Reflective light of two FBGs was
split through coupler2 and went into chirped gratings with different pass-band. Demodulation method adopted chirped
grating and long period grating edge linear filtering technology. It can send each reflected spectrum to different edge
filter. It makes every FBG's reflective spectrum was demodulate. The central reflected wavelength of two FBGs was
1546.15nm and 1554.17nm respectively. Through simulation experiment, we can get that (formula available in manuscript). Strain measurement ranged from 0 to 2000 με. Temperature measurement ranged from 0 to 200°C.
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